The log will say: "Cannot guarantee log consistency. Shutting down."
In simpler terms: Your system attempted to perform a guarded update on a specific disk block, expecting it to contain a known value. When it read the block, the actual value was different, so the update was rejected. The log will say: "Cannot guarantee log consistency
Firmware bugs or misconfigurations on the storage array can lead to incorrect reporting of block states. the actual value was different
: Ensure that HBAs, firmware, and storage array versions are all on the VMware Compatibility Guide Update HBA Drivers The log will say: "Cannot guarantee log consistency